BIPM Time Dept database

BIPM Time Department Data Base
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Current atomic clocks participation in TAI statistics :

( this table does not reflect the effective current participating clock number :
all clocks not officially declared as 'stopped' by laboratories in the database are visible in this table )

Total H-maser Cs clock Rubidium Other

655 258 381 0 16

Monthly clock statistics:

Global statistics on atomic clocks participating to TAI
Relative clock weights for intervals of one month. (weights for year 20YY and month MM are available in file wYY.MM)
Monthly rates of TAI-clock for intervals of one month. (rates for year 20YY and month MM are available in file rYY.MM)
Frequency drifts of the clocks using a monthly realization of TT(BIPM) as reference. (Monthly drifts for year 20YY and month MM are available in file dYY.MM)

Atomic Clocks and PSFS terminology for BIPM clock codes :

Laboratories contributing to TAI have to provide clock data using a BIPM clock identification code.
The rule for BIPM clock code generation is defined here and an automatic tool to provide BIPM clock code is available here.

The list of codes used to generate clock codes can be found below :

Clock type code	Clock type	Clock model code	Clock model
12	Commercial Cesium clock		HEWLETT-PACKARD 5061A
13	Commercial Cesium clock		EBAUCHES, OSCILLATOM B5000
14	Commercial Cesium clock		HEWLETT-PACKARD 5061A OPT. 4
15	Commercial Cesium clock		DATUM/SYMMETRICOM Cs III
16	Commercial Cesium clock		OSCILLOQUARTZ 3200
17	Commercial Cesium clock		OSCILLOQUARTZ 3000
18	Commercial Cesium clock		MICROSEMI Cs 4000
19	Commercial Cesium clock		RHODES AND SCHWARZ XSC
21	Commercial Cesium clock		OSCILLOQUARTZ 3210
22	Commercial Cesium clock		OSCILLOQUARTZ OSA 3230B/3235B
23	Commercial Cesium clock		OSCILLOQUARTZ EUDICS 3020
24	Commercial Cesium clock		OSCILLOQUARTZ 3230
25	Commercial Cesium clock		HEWLETT-PACKARD 5062C
30	Commercial Cesium clock		HEWLETT-PACKARD 5061B
31	Commercial Cesium clock		HEWLETT-PACKARD 5061B OPT. 4
32	Commercial Cesium clock	01	OSCILLOQUARTZ OSA 5585B
32	Commercial Cesium clock	02	OSCILLOQUARTZ OSA 3300-HP
32	Commercial Cesium clock	03	OSCILLOQUARTZ OSA 3300-SHP
34	Commercial Cesium clock		H-P 5061A/B WITH 5071A TUBE
35	Commercial Cesium clock		MICROCHIP 5071A/5071B HIGH PERFORMANCE TUBE.
36	Commercial Cesium clock		MICROCHIP 5071A/5071B LOW/STANDARD PERFORMANC
37	Commercial Cesium clock		OSCILLOQUARTZ OSA 3300
38	Commercial Cesium clock		Chengdu Spaceon Electronics Company TA1000
40	UNSPECIFIED HYDROGEN MASER
41	HYDROGEN MASER	10	T4S iMaser 3000 ACTIVE H-MASER
41	HYDROGEN MASER	20	MICROSEMI ACTIVE H-MASER MHM 2010
41	HYDROGEN MASER	31	KVARZ CH1-76 PASSIVE H-MASER
41	HYDROGEN MASER	30	KVARZ CH1-75A ACTIVE H-MASER
41	HYDROGEN MASER	40	OSCILLOQUARTZ OSA 3700 PASSIVE H-MASER
41	HYDROGEN MASER	50	VREMYA-CH VCH-1003A ACTIVE H-MASER
41	HYDROGEN MASER	51	VREMYA-CH VCH-1033 ACTIVE H-MASER
41	HYDROGEN MASER	52	VREMYA-CH VCH-1008 PASSIVE H-MASER
41	HYDROGEN MASER	32	KVARZ CH1-95 ACTIVE H-MASER
41	HYDROGEN MASER	11	T4S pHMaser 1008 PASSIVE H-MASER
41	HYDROGEN MASER	12	T4S iMaser 4000
41	HYDROGEN MASER	53	VREMYA-CH VCH-1003M ACTIVE H-MASER
41	HYDROGEN MASER	21	MICROSEMI ACTIVE H-MASER MHM 2020
41	HYDROGEN MASER	54	VREMYA-CH VCH-1005 ACTIVE H-MASER
41	HYDROGEN MASER	22	MICROSEMI ACTIVE H-MASER MHM 2000/2001
41	HYDROGEN MASER	01	ANRITSU H-MASER
42	Commercial Rubidium clock	10	MuQuans MuClock
42	Commercial Rubidium clock	20	SpectraDynamics cRb-Clock
50	Commercial Cesium clock		FREQ. AND TIME SYSTEMS INC. 4065A
51	Commercial Cesium clock		DATUM/SYMMETRICOM 4065 B
52	Commercial Cesium clock		DATUM/SYMMETRICOM 4065 C
53	Commercial Cesium clock		MICROSEMI 4310 B
75	OPTICAL TRANSITION 27 Al+
76	OPTICAL TRANSITION 171 Yb+ (octupole)
77	OPTICAL TRANSITION 171 Yb+ (quadrupole)
78	OPTICAL TRANSITION 88 Sr+
79	OPTICAL TRANSITION 199 Hg+
87	OPTICAL TRANSITION 199 Hg
88	OPTICAL TRANSITION 171 Yb
89	OPTICAL TRANSITION 87 Sr
92	GROUND-STATE HYPERFINE TRANSITION OF133 Cs
93	GROUND-STATE HYPERFINETRANSITION OF 87 Rb

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The information contained in this website is for general information purposes only.
The BIPM Time Department makes no representations or warranties about the completeness, accuracy and reliability of the information.

Total	H-maser	Cs clock	Rubidium	Other
655	258	381	0	16